ITEM NAME:4mm Air Tube Brass Metal Pneumatic Compression Fitting Connector Coupler Y9A9 4mm Air Tube Brass Metal Pneumatic Compression Fitting Connector Coupler Y9A9 Double Ended, Metal brass construction for greater durability, ensure reliable connection.Connect conveniently with the Compression Fitting. Used widely in pneumatic piping as a quick fitting joint, is easy to connect. Fit Tube(OD):4mm / 5/32"(0.157") Overall Size:30 x 10 x 10mm / 1.2" x 0.39" x 0.39"(L*W*T) Material:Metal & Brass Weight:26g Color:Gold+Silver Package Content:1 x Compression Fitting Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Used widely in pneumatic piping as a quick fitting joint, is easy to connect. Fit Tube(OD):4mm / 5/32"(0.157"). Color:Gold+Silver.